My dad is giving me the ultimatum

Actually, you did just make an assumption, and an incorrect one, because I’ve read every post in this thread. The father is withdrawing financial support and has stopped talking to the OP and the rest of her immediate family in order to force her to go to a peer school of UVA which is more costly, and which would mean she has to take out debt. He may have great intentions, but the way he’s carrying them out is manipulative. Even if he’s making some weak attempt to do the right thing, I don’t think there’s any sound argument that he * is * doing the right thing.